package com.food.service.impl;

import com.food.context.BaseContext;
import com.food.dto.ShoppingCartDTO;
import com.food.entity.Dish;
import com.food.entity.Setmeal;
import com.food.entity.ShoppingCart;
import com.food.mapper.DishMapper;
import com.food.mapper.SetmealMapper;
import com.food.mapper.ShoppingCartMapper;
import com.food.result.Result;
import com.food.service.ShoppiingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.ListableBeanFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl  implements ShoppiingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private ListableBeanFactory listableBeanFactory;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     * @return
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车的商品是否已经存在了
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userId= BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list= shoppingCartMapper.list(shoppingCart);
        //如果已经存在了，只需要将数量加1
        if(list !=null && list.size() >0){
           ShoppingCart cart= list.get(0);
           cart.setNumber(cart.getNumber()+1);
           shoppingCartMapper.updateNumberById(cart);
        }
        else {
            //如果不存在，需要插入一条购物车数据

            //判断本次添加到购物车的是菜品还是套餐
            Long dishId=shoppingCartDTO.getDishId();
            if(dishId!=null){
                //本次添加到的购物车是菜品
               Dish dish= dishMapper.getById(dishId);
               shoppingCart.setName(dish.getName());
               shoppingCart.setImage(dish.getImage());
               shoppingCart.setAmount(dish.getPrice());
            }
            else {
                //否则添加到购物车的是套餐
                Long setmealId=shoppingCartDTO.getSetmealId();
               Setmeal setmeal= setmealMapper.getById(setmealId);

                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }


    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获取到当前微信用户的id
        Long userId=BaseContext.getCurrentId();
        ShoppingCart shoppingCart=ShoppingCart.builder()
                        .userId(userId)
                        .build();
        List<ShoppingCart> list=shoppingCartMapper.list(shoppingCart);

        return list;
    }

    /**
     * 清空购物车
     * @return
     */
    @Override
    public void cleanShoppingCart() {
        //获取到当前微信用户的id
        Long userId=BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);

    }

    /**
     * 删除购物车单个商品
     * @return
     */
    @Override
    public void deleteShoppingById(ShoppingCartDTO shoppingCartDTO) {
        // 获取到当前微信用户ID
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart=new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(userId);

        // 查询购物车中是否存在该商品（
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        // 只有存在该商品时才执行减一操作
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            int currentNumber = cart.getNumber();

            if (currentNumber > 1) {
                //  数量 > 1：直接减一
                cart.setNumber(currentNumber - 1);
                shoppingCartMapper.updateNumberById(cart);
            } else {
                // 数量 = 1：减一后数量为0，直接删除该记录
                shoppingCartMapper.deleteShoppingById(shoppingCart);
            }
        }



    }
}
